CN101184236B - Video compression system - Google Patents

Video compression system Download PDF

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Publication number
CN101184236B
CN101184236B CN2007101670852A CN200710167085A CN101184236B CN 101184236 B CN101184236 B CN 101184236B CN 2007101670852 A CN2007101670852 A CN 2007101670852A CN 200710167085 A CN200710167085 A CN 200710167085A CN 101184236 B CN101184236 B CN 101184236B
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video
order
color
pixel
byte
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CN101184236A (en
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W·A·丹布拉卡斯
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Victor Information Technology Systems Inc
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Avocent Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
    • H04N19/426—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements using memory downsizing methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/507—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction using conditional replenishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/93—Run-length coding
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/24—Keyboard-Video-Mouse [KVM] switch

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Color Television Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Image Processing (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Digital Computer Display Output (AREA)

Abstract

A video compression system is disclosed that is optimized to take advantage of the types of redundancies typically occurring on computer screens and the types of video loss acceptable to real time interactive computer users. It automatically adapts to a wide variety of changing network bandwidth conditions and can accommodate any video resolution and an unlimited number of colors. The disclosed video compression encoder can be implemented with either hardware or software and it compresses the source video into a series of data packets that are a fixed length of 8 bits or more.

Description

Video compression system
The application be that April 7, application number in 2003 are 03816346.2 the applying date, denomination of invention divides an application for the application of " video compression system ".
Technical field
The present invention relates to computer data and handle, more particularly, relate to the computer video compression.
Background technology
The compressible video data stream of existing video compression system, so it consumes less bandwidth and sends through communication channel.The redundancy that these system's utilizations expectations occur in the video that they plan to compress.For example, JPEG and MPEG utilize common similitude in the color of neighbor of photographed images.In addition, true below MPEG utilizes: as often to have many pixels in many frames of video, to keep same hue in the moving image, perhaps only move and on screen, move its position along with video camera.
According to video quality descend (or " video loss ") how much be that the people (or " user ") that watches video is acceptable; Further compressed video also, but the acceptability of dissimilar video loss depends on user's activity (or " application ") to a great extent.Four kinds of video loss are: (1) resolution loss (seeming fuzzy); (2) color depth loss (having still less tone); (3) frame rate loss (stall of moving image or vibration), and (4) loss of time or " slowed-down video " (from video capture to its time delay that can supply watch).
In order to realize higher compression ratio, the different compression system utilizes user that they will the satisfy type of receptible video loss.For example, adopt MPEG, utilized resolution loss to send, accept frame rate loss or color depth loss above them because the film spectators accept resolution loss for communication channel produces multidata quick acting picture.
Slowed-down video is not a problem in some applications, but in other is used, is serious problems.The different compression system adds different retardations when their compressed videos.Add more systems that postpone more and obtain higher compression ratio, because the better possibility that all frame of video that are captured, preserve and check at timing period provide decision how they to be compressed.An instance possibly be: " video camera is moving or having only an object in the picture to move ".
Slowed-down video is not a problem for " unidirectional " User Activity of for example watching film; Therefore, the compressibility (for example MPEG) that is used for these application adds long delay (many seconds or longer) at compressed video and before beginning it is sent through communication channel.In fact, when communication channel was the network (like the internet) with uncertain bandwidth availability, the video that receives from this network often was cushioned before being shown and postpones many seconds in addition (so that eliminating stall that network congestion causes).Though time delay is not a problem for the unidirectional User Activity of for example watching film, for real-time " alternately " user, for example be serious problems as the user of the cursor of the part of compressed video image through mouse control.
A kind of like this instance of real-time, interactive user relates to the Long-distance Control through the computer KVM control desk (keyboard, video display and mouse) of communication channel.In these " remote consoles " are used; Keyboard and mouse data are sent from remote console through communication channel; And " exchange " to many " target " server computer one of them, just look like that keyboard is directly connected on that destination server the same with mouse.Corresponding video sends to remote console from destination server, and it is the same to just look like that destination server is directly connected to the video display of remote console.At common all United States Patent (USP)s the 5721842nd of authorizing people such as Beasley and authorize the instance of having described the KVM system in No. 5732212 of people such as Perholtz, each is attached among this paper by reference in them.
The communication channel of some KVM systems provides enough bandwidth to transmit uncompressed video, because they use special-purpose local cable and special circuit exchange.Compare with the KVM system based on the local cable of special use, the KVM system (for for purpose of brevity, being called " KVM/IP " system among this paper) that is adapted on the network carrying out via for example Internet Protocol work provides limited uncertain bandwidth availability.Send keyboard in time and mouse message is the aspect that the KVM/IP system is concerned about from remote console to selected destination server.The aspect of more being concerned about is to send more a large amount of video datas back to remote console in time.Because current typical computer is with the continuous output video of speed more than per second 2 gigabits, and remote internet connects (for example DSL) and carries out work with per second 1 megabit usually, therefore requires average 2000 to 1 the video compression ratio that surpasses fully.Utilize dialing modem to carry out the higher average compression ratio of remote internet connection request of work with per second 50 kilobits.
When the remote console user moves its mouse perhaps in typewriting on its keyboard so that to server input fresh information; Those actions must be passed to server; And take action according to them by server; So that create new video image, these new video images are sent back to the remote console user's screen.Delay to remote console user loopback video is bothersome, because they set up temporary transient delay at keyboard or mouse message by user's input and user between the video response of experiencing on its screen.The less troublesome of delay that the movable retardation ratio of companion keyboard follows mouse to move, so term " mouse-cursor response " is used for describing this problem.
This problem (the above) that remote console is used is not suitable for the representative network browser application of some type.For network browser application, video cursor glyph this machine on user's computer is created, so mouse-cursor response is fine all the time, even network is very slow aspect the video image of response server generation.Use for remote console, network delay influences mouse-cursor response, because cursor is represented as the part from the video image of server, and is sent to remote console through network.
In remote console is used, acceptable opposite fully with other Video Applications for the user of four kinds of video loss.As stated, it is a factor during remote console is used that minimum video time postpones, but slowed-down video is not too important a kind of video loss in other is used.The importance of the resolution loss during remote console is used is also used on the contrary with other, generally includes a large amount of than the alphanumeric text of small font, many small icons and many high-contrast sharp edges because send to the computer screen of remote console.Add the compressibility of resolution loss, possibly be satisfactory for other many application, but they know that for reading the small font alphanumeric text and having high-contrast the image at edge is nonconforming like JPEG or MPEG.The acceptable reverse order of user also is applicable to color depth loss and frame rate loss.These two kinds of video loss are that the user during remote console is used is the most acceptable and be the most difficult acceptance in other Video Applications.
Though existing video compression system is widely used and the utmost point is suitable for various application, need carry out the video compression system of optimizing for the possible interactive computer user experience of the best.
Summary of the invention
The present invention is a kind of new video compression system, and it is optimized to utilization and appears at the redundancy on the computer screen usually, and is optimized to and utilizes the acceptable video loss type of real-time, interactive computer user.In one embodiment of the invention, it is five combinations different, unique " order " of choosing that the computer video frame of being caught is " encoded ", and these orders are to select and sort according to the ability that they compress the video of catching most effectively.These orders send to " client computer " through network, and how their indications continuously (or order) " decoder " are about decompressing or decoding to order, and on the long-distance video display, rebuild the frame of video of being caught therein.With unique mode, present embodiment can carry out compression and decompression and not have resolution loss or color depth loss computer video, but has according to the dynamically frame rate loss of adjustment of available network bandwidth.It also adds the minimum delay in the Code And Decode process.
Five orders are: old pixel (be called " frame no change early ", " no change " sometimes or be called for short " NC ") is duplicated from frame early in (1); (2) copy pixel from the left side; (3) copy pixel from the top; (4) utilize 2-look collection to make a series of pixels, and (5) utilize bulletin colour to make one or more pixels.Each order provides unique efficient when being used for hierarchy.In addition, these orders are included in by in 8 or the content that more packet of the regular length of multidigit is formed, make them can adopt software or hardware to come to send easily, receive the decode.The invention is not restricted to any order or data packet length, but the length that preferred embodiment usually adopts is 8 multiple (for example 16,32 or 64), make they with generally use and general obtainable element and processor compatibility.
In more broad sense embodiment of the present invention, use above-mentioned a kind of, two kinds, three kinds or four kinds of orders individually or with any combining form.For example, the inventor thinks, the use of making the order of a series of pixels from 2-look collection separately is unique when compression comprises the video (for example checking this document through word processor) of a large amount of alphanumeric texts.When other order is added to wherein with various combinations, obtain other advantage and efficient.In other embodiments, one, two, three, four or all five orders are used in combination with the prior art compressibility of any kind of to strengthen the video compression of known system.For example, MPEG, JPEG and other technology (and all variants (for example MPEG2 etc.)) can with the one or more video compression that compress technique arranged to strengthen earlier that are used in five orders as herein described.
In the other embodiments of the invention that are called " gradation preference " color mode,, can further compress the video of being caught through utilizing the fact that more can accept the color depth loss compared with video loss, the remote console user of other any kind.In this pattern, each pixel of the video of catching be converted in one group of color of choosing especially typical color used on the matching computer screen near color.Grey is preferential in this group color, because they are preferential (white and black are included in the definition of " gray scale ") on the normatron screen.
The present invention can be through adopting hardware, adopting software or adopt the compressed encoding that combination realized of hardware and software to embody.Equally, decoding also can be adopted hardware, employing software or adopt it to make up and realize." source " video can be caught through the Video Controller chip that is directly connected in the computer.Perhaps, video can be caught from external analog video output, external digital video interface (DVI) or other external interface of computer.In one embodiment, video compresses through the hardware that adopts FPGA (field programmable gate array) or ASIC (application-specific integrated circuit (ASIC)).In another embodiment, video is being made into to adopt software to compress fully before the video output streams.
The video compression order sends to remote console through network, and they are extracted to contract and show to the user therein.Remote console can be conventional P C (personal computer), and it utilizes PC software to command decode, and perhaps it can be small-sized " thin client " device that adopts the low performance microprocessor built.In one embodiment, these orders all are designed to be made up of one or more 8 bit data bags, make them to decompress easily through the software that on the low performance microprocessor, moves.Perhaps, hardware unit (for example FPGA or ASIC) can be to the order complete decoding in remote console.In this case, remote console does not require that calculation element is used for command decode, does not require that perhaps the Video Controller chip is used for the video of explicit user.This low-cost hardware (or hardware/software of combination) remote console is in following being called " little client computer ".
The present invention also can be applicable to computer " blade " technology, and wherein, each server computer is included on the single deck tape-recorder, is assembled into many such cards in the public blade holder, so that shared public power and Central Control Function.Can be the user that local cable connects based on the KVM switching technology of traditional cable on the blade visit to each blade computers is provided; But; If the user need be through the KVM visit of network blade; Then the present invention can be included in the blade holder or on each blade, and the video compression order can be provided for the public network interface in the blade holder, so that send to various remote consoles through network.
Therefore, the present invention can be used for general compress machine video, so that through LAN, WAN, dialing or other any network sending computer video, is used for using and remote console application (for example KVM/IP system) in thin client, little client computer.
Description of drawings
The present patent application file comprises at least one colored drawing.This patent or the disclosed copy of patent application of being furnished with coloured picture will be provided by Patent Office after asking for and paying necessary expenses.
Fig. 1 is the schematically illustrating of an exemplary embodiment of the present invention in having the KVM/IP that adopts the client computer that PC software realizes;
Fig. 2 is schematically illustrating of an exemplary embodiment of the present invention, and the built-in function of hardware video compression device is described;
Fig. 3-the 10th, the form of the video compression order in an exemplary embodiment of the present invention with 8 packet lengths;
Figure 11 is a flow chart, is described among " 7 gradation preference color modes " of the present invention embodiment how to reduce color depth;
Figure 12 is the colour print of the test pattern (being called 0-255 RGB+ gray scale test pattern) on the video screen of computer that is 24 colors settings;
Figure 13 is the colour print of the client computers screen when to adopt " 7 gradation preference color modes " embodiment of the present invention and source video be test pattern shown in Figure 12;
Figure 14 has video creation software and the schematically illustrating of an exemplary embodiment of the present invention of the Video Controller chip that combines with video compressor;
Figure 15 does not have the Video Controller chip but the schematically illustrating of an exemplary embodiment of the present invention with software video compression;
Figure 16 is the schematically illustrating of an exemplary embodiment of the present invention that is called little client computer;
Figure 17 is schematically illustrating of an exemplary embodiment of the present invention, describes the notion of " shared model ";
Figure 18 is a flow chart, is described among " 5 gradation preference color modes " of the present invention embodiment how to reduce color depth; And
Figure 19-the 24th, the form of the video compression order in the alternative of the present invention that is used with 5 and 12 color modes.
Embodiment
The present invention is capable of using to be intended to through communication channel, comprise through any hardware or the software of meta network sending computer video and realizing.A kind of such example embodiment is as shown in Figure 1, by way of example and non-limiting mode is described.In fact, in case the technical staff has read the present invention who embodies and describe in this article with accompanying drawing, will be understood that other embodiment.
In Fig. 1, KVM/IP system 10 comprises remote console client computer 11 and server apparatus 14.In the embodiment shown, remote console 11 is realized through the PC software among the ready PC of network (comprising keyboard, video display and mouse).Client computer 11 is via ip network 13, transmit to destination server 15 through KVM/IP equipment 14.Equipment 14 comprises standard network I/O hardware and software with client computer 11, thereby allows them to communicate via any type of Internet Protocol connectedness, for example dialing, DSL, WAN, LAN, T1, wireless or the like.
In Fig. 1, said equipment allows client computer 11 that its keyboard, video display and mouse are coupled to server 15 as the intermediary between destination server 15 and the client computer 11, is directly connected to it as client computer 11.Aspect this; The mode of the system 10 that combines with the addressing and the exchange capacity of IP network is represented the KVM switch with operation; For example by this assignee, by Huntsville; The Cybex Computer Products of Alabama and by Redmond, those products that the Apex.Inc. of Washington sells.
Client computer 11 comprises the software of being convenient to for example pass through standard TCP/IP Address Recognition destination server 15 (via equipment 14).Communicate by letter in case between client computer 11 and equipment 14, set up, then client computer 11 adopts softwares to be sent in keyboard and the mouse data of importing on the client computer to equipment 14 via IP network 13.Equipment 14 receives exchange or is routed to its data, and these data are applied to the keyboard and the mouse port of server 15, just looks like keyboard and to be directly connected to server 15 the same for mouse.As response, server 15 (via the no matter Any Application of operation on server 15 just) is taken action according to keyboard and mouse data, thereby produces new video data, this video data via the video output terminals of server 15 by the equipment of outputing to 14.
In case equipment 14 receives the video from server 15, then one of invention algorithm through following description compresses it, and is sent to client computer 11 to the order of gained video compression via IP network 13.Compression can be carried out through the FPGA in the equipment 14, ASIC or other any hardware or software.Perhaps, equipment 14 can " embed " server 15, if perhaps server 15 comprises that carrying out this compression also directly sends the software of gained order to IP network 13, then can remove equipment 14.After reception, client computer 11 adopts PC software to these command decode, and on the screen of client computer PC, reproduces the video of destination server, supplies the user to watch.Perhaps, command decode can adopt the hardware in the client computer 11 to carry out.
In the embodiment in figure 1, the user should feel that keyboard, video display and the mouse of client computer PC are directly connected to server 15, even client computer 11 and server 15 maybe be in the positions that physically is in as far as earth two ends.Add too much delay at the keyboard that obtains to be sent to server 15 during during with mouse data and at the recovery video and can hinder this purpose via equipment 14.Keyboard and mouse require can be fast and the more less data traffic of transmission, but the multitude of video data have proposed more unmanageable problem.For efficient, video must be compressed by equipment 14, transmits via IP network 13, is decompressed by client computer 11, and is presented on the user's screen as early as possible.Excessive deferral is the most obvious in mouse-cursor response.Even appear at that mouse on the screen moves and the cursor response between fine delay also can let the user worried.
Fig. 2 explains an exemplary embodiment of the present invention.Exist many different hardware of the present invention and softwares of can designing therein to realize that the embodiment of Fig. 2 is not unique this mode.After reading this theory, the technical staff can understand and realizes alternate manner of the present invention, scope according to the invention.
At the top of Fig. 2, source video 21 can adopt any form, simulation or digital.The video output of most of existing Video Controller chip can digital form and flat-panel monitor be used, for example be used for laptop computer.Video compressor 23 can be directly connected to the output pin of Video Controller chip 20, perhaps can be connected to the aerial lug on the destination server 15.A kind of aerial lug is DVI (digital visual interface), and it is a kind of standard that is used for being connected to digital video the external digital display unit.The source video of other any kind also can be satisfied the demand---the invention is not restricted to this.
As selection, color depth reducer 22 can be included in the video compressor 23, so that reduce the figure place of each pixel color of definition.Carry out this operation through being categorized as color of pixel in some districts.When source video 21 was digital video, the straightforward procedure that color depth reduces was to ignore least significant bit.For example, through ignoring in 8 red, green and blue signals 3 least significant bits of each, 24 colors can be exchanged into 15 colors.4 least significant bits ignoring each 8 chrominance signals will produce 12 colors.The more complicated color minimizing method that is called 7 gradation preference color modes and 5 gradation preference color modes is further described below and explanation in Figure 11 and 18.
If source video 21 is an analog video signal, then color depth reducer 22 need comprise A-D (modulus) transducer.For analog video, each pixel is defined by three analog signals (red, green and blue).What " district " the A-D transducer is in through three signals that detect each pixel, makes its intensity digitlization (very similar with the operation that above-described digital color depth reducer is carried out).With the main difference of analog video be noise.When analog signal was in the edge in certain district, a small amount of analogue noise possibly make digitizer in subsequent frame, distinguish another district from one to beat back and forth.In this case, seem, even it does not change as if source video 21 is changing.Therefore, for analog input, need reduce this " beating in the district " with certain noise suppressing method.Can adopt any noise reduction techniques, but in an example, in the time of in input signal is in certain district, it must leave that at least one threshold amount of district, ability is regarded as is in another district.The signal that each pixel in the frame of video is carried out each pixel is in this comparison in what district in former frame.
Though described some embodiment consider within the present invention for the source video, the particular example embodiment supposition digital video that Video Controller receives from destination server 15 among Fig. 2 is the source video.Video chip 20 is output as source video 21, and it is the continuous video data flow.Video Controller chip 20 need not receive the control (but the present invention can be used in combination with the control of certain video chip undoubtedly) of any aspect of the present invention, that is to say, video chip 20 will come output video with the Continuous Flow that meets itself internal timing.
Source video 21 is inputs of video compressor 23.Certainly, other processing unit, like general or application specific processor instead hardware video compression device 23.Video compressor 23 comprises at least two frame buffers 24 and 25, and for additional computational complexity and efficient, also can comprise many additional frame buffers or frame buffer type.Before client computer 11 connects through network 29, at frame buffer 24 or 25 in one of them (in the moment shown in Figure 2, frame buffer 25 is movable, represent it catching video) continuous capturing (and overwrite) continuously source video 21.
When client computer at first connected through network 29, video capture stopped, and encoder 26 begins to read and compression buffer 25 in the video data of being caught.It proceeds to the ending (for the bottom right pixel of screen) of frame buffer from beginning (being the top left pixel of the screen) beginning of frame buffer individual element, prepares for and make up the most effectively command sequence.In encoder 26 these command sequences of structure (according to the algorithm embodiment of following description), server CPU27 sends to client computer 11 with network 29 with them via I/O 28.After last pixel that encoder 26 is accomplished in the buffer 25, frame buffer exchange and source video begin in another frame buffer (being buffer 24 in this example), to be captured.Even CPU 26 does not also accomplish to network 29 and sends these orders, this exchange also can take place.After exchange, the frame in the buffer 25 becomes " old " frame, and is illustrated in the frame that shows (perhaps will be shown soon) on the screen of client computer.
Because the source video proceeding when not being captured, therefore when catching when beginning, it possibly be in other any position in centre or the screen of screen.No matter the position that the new seizure in the buffer 24 begins how, it all continues a complete circle, until the screen position that comes back to when beginning to catch.The result is complete " newly " frame of video that video 21 is caught from the source.If CPU 27 also can't send all orders (possibly be because network congestion or slow network) from first condensed frame through network after having caught new video frame, then capture-process will continue the video of being caught in the overwrite buffer 24.When network is ready to (and having caught at least one frame of video) for more orders, seizure will stop, and will proceed for the identical process that first frame takes place.But because at this moment client computer 11 have its first frame, so at this moment encoder 26 can compare each pixel in the new frame and each pixel in the old frame, if pixel does not change, then the compression meeting is much better.Be captured and after network was ready to for more orders, at this moment identical process was proceeded at least one frame of new video.This process of when waiting for that network is ready, catching continuously is reduced to the valid frame speed of client computer according to network condition, and shows that " up-to-date " video has precedence over demonstration and " owns " video.The video of in fact, being caught becomes the commodity that expire.Compared with the slowed-down video that must tolerate under the situation of being lined up at " owning " video motion and sending after a while, the remote console user more can accept the frame rate loss.
Therefore, in this example, new frame buffer (old frame buffer originally) is caught nearest source frame of video.Then, old frame (in old frame buffer) and new frame (in new frame buffer) are read by encoder 26, are used for comparison and compressed video.There is seizure and compares frame of video so that the alternative approach of compression is not described all these methods among this paper.
Aspect the more narrow sense of embodiments of the invention, adopt all aspects that are directed against the described video coding of Fig. 3 among this paper.Detailed description to " the present invention " described all that aspect among this paper should not be construed as each aspect that expression the present invention requires said exemplary algorithm.It is exemplary methods wherein can realizing efficient of the present invention in order to describe that these instances are provided.In addition, more broad sense or more narrow sense, some aspects of the present invention can realize according to following description.Therefore, in Fig. 3, provide five video compression orders to be used for compressing the video that reads from frame buffer 24 and 25.According to hierarchical order, they are: old pixel is duplicated from frame early in (1), and (2) are copy pixel from the left side, and (3) are copy pixel from the top, and (4) utilize 2-look collection to make a series of pixels, and (5) utilize bulletin colour to make a pixel.The inventor finds, classification order this is combined as computer and shows significant video compression is provided.First three provides 3 dimensions to duplicate (level, vertical and time) in these orders, and fourth command provides unique efficient for the screen section of only being made up of two kinds of colors (for example text).
In the embodiment shown in fig. 3, five different video compression orders are arranged.All orders all are made up of individual data bag or a plurality of packet, and wherein each packet is made up of an octet.First packet of each order last to three be operation code (or " command code "), basic function that their confirm to be ordered." E " position is " expansion " position, and all the other positions (R, C and P) are " payload " position.The general format of five orders is as shown in Figure 3, and their more long form is shown in Fig. 4-10.For the embodiment with different pieces of information packet length, the quantity of payload bits is different.For example, 16 bit data bags have 8 additional payload bits usually.
Lowest hierarchical is ordered, is that MP (making pixel) order has one in first bit cell (bit position seven), follows the payload bits (" P " position) (neither one is with at the beginning in other order) of definition color afterwards.If the quantity of used color position is seven, then the MP order is a byte long (as shown in Figure 3).If the quantity of used color position is 15, then the MP order is two byte longs, and wherein first of first byte is one (as shown in Figure 4).Equally, if the quantity of used color position (P position) is 23, then the MP order is three byte longs (as shown in Figure 5), and the rest may be inferred.MP order is the simple command that is appreciated that, and minimal compression is provided.It is said main " making a pixel is this color ", wherein this color of payload sign.A kind of 15 colors (5 are used for redness, and 5 are used for green, and 5 are used for blueness) that generally are set at of computer console.15 colors are ordered through two byte MP and are supported.Because byte MP order has seven payload bits, so they can provide 27 (or 128) to plant different colours.7 gradation preference color modes that further describe below describe the source video how can by " simplification " near 128 looks that extensively adopt on the computer console.The operation through byte MP order is described in the following argumentation of operation of the present invention, but the invention is not restricted to the color position (P position) of concrete quantity.
Aspect compressibility, wherein each pixel is incompressible (other compressibility, can provide have the compression of resolution loss in various degree like JPEG, fractals etc.) for the frame of color at random not having under the prerequisite of resolution loss.For the embodiment of Fig. 3, the single pixel of each in this random frame adopts MP to order and encodes, if this frame has a mega pixel, then will adopt 1,000,000 MP orders to its coding.If encoder can't use other any order to pixel coder, then adopt the MP order.Suitable all the time the order through MP of each pixel encoded.Therefore, the MP order appears in the lowest hierarchical position of Fig. 3.As priority list, Fig. 3 shows, encoder 26 attempt carrying out uppermost order, then be second, third, the 4th, arrive the MP order then as a last resort.
Refer now to the command code among Fig. 3, " one " unique identification in the bit position seven is made the pixel order.If in the bit position seven be " zero ", then this order into other four orders shown in Figure 3 one of them, in other four orders of two (bit position five and six) sign application subsequently which wherein.Therefore, the expression of 00 in the bit position five and six CO (duplicating old perhaps no change) order, 01 expression CL (duplicating the left side) order, 10 represent CA (duplicating the top) order, and 11 expression MS (making sequence) orders.After this, each in these four command types has the payload bits of the command code of following.Payload bits is R, C and P position.To order by MS below and discuss the E position.
The number of times that payload bits (R position) expression command operation in CO, CL and the CA order repeats.CO order notice client computer pixel does not change concerning the pixel of current demonstration.Therefore, encoder 26 compares with new frame buffer old, and the pixel of the same position in the current pixel in confirming " newly " frame and " old " frame is called CO and ordered when identical.Like this, for the several portions of the screen that in the video of source, does not have to change, send the CO order.
Two orders subsequently come compared pixels according in common " newly " frame rather than the position between old frame and the new frame.CL order indication client computer is near the copied pixels color of the position in present frame left side.If current pixel is first pixel on the video line, be last pixel of previous row near the pixel in left side then.CA order indication client computer is near the copied pixels color of present frame top.CL, CA and CO order are at the following the Copy command that is called.Available other order replaces, and they provide in the common frame for copied pixels or old frame and the new relation between the frame.Because the level that exists in the computer video and the rapid expansion of vertical rectangle and lines, current described order has special advantage in computer video.For horizontal line, for example, the CL order has special practicality, and for vertical line, the CA order has special practicality.
Last order is MS or makes sequence command that itself is unique in existing video coding type.The MS order utilizes the special aspects of computer video, that is, the major part of normatron screen only is made up of two kinds of colors.Representative instance in computer video is a text message, and wherein the screen major part is made up of the text foreground on the fixed background look.In these cases, MS orders the loss that lets encoder 26 establishment multitude of video and do not have the text definition, and has great decrement.
Now, discuss each order in the context of the payload structure of ordering and in the context in practical application.As stated, CO order (Fig. 3,6 and 7) identifies current pixel not change for the pixel of the same position that is positioned at former frame in fact.For further compression, payload has not only identified current pixel and has not changed, but also has identified the not change of contiguous pixels of some.Below describe quantity what are.As shown in Figure 3, for the CO order, after three bit manipulation sign indicating numbers, there are five (RRRRR) to show the repeat count of this CO order.These five any binary values that can be set between 0 and 31.
Owing to be that zero repeat count is nonsensical, therefore initial usually supposition, unaltered nearly 32 contiguous pixels of former frame relatively in these five the counting definition delegation.But, if only use byte MP order (rather than the MP of two or more byte longs order), then be that one repeat count is also nonsensical, be one the identical compressed value of CO order because a byte makes that pixel (MP) order has with repeat count.In this case, the repeat count payload can be from being that two counting begins, and makes 00000 payload represent that repeat count is that two, 11111 payload representes that repeat count is 33.Like this, little added efficiency is provided, that is, has had below the CO command id of five payloads true: certain position between two pixels and 33 pixels is with respect to not change of the frame that has shown.
This preferred embodiment has further increased efficient.Suppose that surpassing 33 pixels does not change.As shown in Figure 6, second byte that is close to 000 command code can be followed has 000 first byte, thereby provides second five to represent from two to 33 pixels again.But, two continuous data bags that decoder 30 has the CO command code with detection, and be interpreted as two five payloads single CO order with ten payloads.Utilize ten payloads, the quantity of CO pixel expands to 1025 from 34 continuously.In other words, for two eight bit bytes only, the frame that surpasses 1,000 pixels can be sent out to client computer.The efficient of CO order improves gradually.Can notice, make two following just facts of reason: require to surpass 33 repeat count with continuous data bag of CO command code.If do not require to surpass 33 repeat count, then encoder 26 is not made two continuous data bags with CO command code.
If encoder 26 requires 35 or 36 repeat count, this just needs second byte, then two byte CO order become momently invalid.But,, then need only two bytes with regard to compressible full line in case repeat count reaches 1,000 pixels (the for example full line on 1024 * 768 resolution screen).In addition, if second order (as shown in Figure 7) is followed in the 3rd CO order, then decoder 30 detects 15 payloads.If have the 4th CO order, then detect 20 payloads.Nybble CO order can identify and surpass not change of a mega pixel, and this has surpassed the whole required amount of frame with 1024 * 768 resolution.The invention is not restricted to continuous CO order or any video screen resolution of any specific quantity; But for current purpose, five byte command (supporting nearly 3,003 mega pixels) provide the enough big repeat count of full frame for the maximum video screen resolution of current expectation.
CL works with above-described CO order with the CA order identically.They duplicate pixels with different (left pixel or top pixel), but they have same structure, promptly are 5 RRRRR payloads of sign repeat count after the three bit manipulation sign indicating numbers.Equally, each in CL and the CA order can be lined up sequence, as among Fig. 8 to shown in the CL order, thereby form 10,15,20 or longer payload.
If two or more in those orders are suitable for current pixel simultaneously, then the hierarchical priority between CO, CL and the CA order just is suitable for.If encoder 26 is confirmed the CO order and is suitable for current pixel; And there is not other copy command to be fit to; Then encoder is temporarily ignored other copy command, and continues to compare from the pixel of old frame with new frame, thereby confirms the suitable pixel quantity of CO order in the delegation.Encoder 26 carries out identical operations when finding that CA or CL order is suitable for current pixel separately.No longer be genuine first moment in identify (CO, CA or CL) condition, encoder 26 sends one or more serial commands of Fig. 3, assesses the next pixel that will encode then.In other words, be true in case encoder 26 is confirmed repeat count conditions for given pixel, and have only a repeat count condition for given pixel for true, then ignore other all orders and assess, up to current repeat count condition no longer valid.When the sort of situation occurring, it creates order (command code and repeat count), and sends it to client computer.
As long as a copy command (CO, CL or CA) is fit to, then encoder is proceeded it, and is no longer suitable up to it.Then, encoder finishes and should analyze, and creates suitable byte.But if a plurality of repeat count condition (CO, CA or CL) originally is suitable on same pixel, then encoder just begins the contiguous pixels that those conditions are suitable for is counted.As long as one of these orders are fit to, counter continues operation.At last, encoder only selects to apply for an order of complete repeat count, thereby it is only counted a counter.Need not move three different counter that each copy command uses.Then, when encoder continues counting, it will find that some order is no longer suitable.When enough number of times appear in the sort of situation; Making does not have command type " to keep still effective ", the repeat count of suitable pixel quantity before command code and the order that is identified at last survival that encoder 26 is created the order of last survival can't be fit to.
For example, suppose that CL, CA and CO order all are fit to for current pixel.Encoder writes down the sort of situation, and begins counting.In next pixel, encoder confirms that all orders stand good, thereby is increased to two to counter.This process is fully likewise carried out, and is no longer suitable up to CL condition in the 7th pixel.Encoder 26 makes CL out of service, and continues to increase counter.Proceed, suppose that in the 14th pixel, the CA condition becomes vacation.The CO order is the order of last survival, but encoder does not still stop counting.Continue to increase counting, in the 51st pixel, the CO condition becomes vacation up to supposition.At this constantly, encoder 26 sends two successive bytes to client computer 11: 00000001 and 00010000.First byte shows the CO condition (command code=000) that at first appears as three repeat count (everybody remembers that " zero " specified repeat count is two).But when decoder 30 was prepared for next byte in advance, it saw that continuous CO order is read to form ten words jointly.(notice that decoder 30 also can be noted the next byte above 00010000 byte before to the word decoding, do not follow second byte so that guarantee the 3rd CO byte.) ten words 0000110000 are equivalent to repeat count 50.This serial instruction decoding device of two CO order does not change the color of back 50 pixels, keep with previous transmit frame in color the same.
In case certain copy command becomes last still effectively order, the command code of Next Command is determined.When this last still effectively order is no longer suitable, then the repeat count of that order is determined.At this constantly, encoder confirms also how many bytes are the sign repeat count need.If can this counting be provided in five, then encoder produces a byte command.Ten if desired, then encoder produces two byte command, and the rest may be inferred.This aspect of preferred embodiment is favourable because it with the best mode utilization to the possible sign of long repeat count.In fact, it is contemplated that other copy command outside CA, CL and the CO, they identify pixel according to other related fields.
If two or more in those orders are remained valid equally always, then the hierarchical priority between CO, CL and the CA order is suitable for.In this case, encoder at first takes to duplicate old order.Duplicate old order and on client computer, present minimum burden, because the result just skips pixel.On the other hand, client computer must be worked to duplicate from the top or to duplicate from the left side.Among these two copy commands, higher on the left of duplicating than the priority of duplicating from the top, be because it presents less burden on client computer equally.For duplicating the left side, client computer only need read near the pixel of front once, and it is write a plurality of pixels.But in order to duplicate from the top, video line reads a plurality of pixels from the top in dependence, and writes a plurality of pixels.
On the other hand, if client computer adopts hardware rather than software to realize, then copy command priority maybe it doesn't matter, because hardware possibly be exclusively used in processing command.Preferred embodiment makes the load on the software client minimum through confirming the priority of copy command.
The 4th command type (and limit priority of non-copy command) is Fig. 3, the MS shown in 9 and 10 (making sequence) order.According to analysis, make sequence command and finish to promote compression efficiency greatly to the compression of normatron screen.Theory about MS order is, text color why no matter, and it almost is always two look patterns.In fact, the inventor has investigated the normatron screen and has confirmed that other zone of the major part of text and screen can be adopted long MS to order and defined.The MS order provides the high efficiency of the textual portions of compression icon, document, label and tool bar.Other compression scheme or necessary compression efficiency is not provided, or the desired definition of user that needs to read the text information on the screen is not provided.
For example, adopt the positive rolling text of user to make its example from a frame to next frame, text just moves on slightly.From the viewpoint of compressor reducer, each frame is the new pixel groups that need be encoded.Compressor reducer can be ordered and obtains some repeat count efficient through write CO for the text window peripheral region, but when running into adjusted text, then the repeat count compression becomes invalid, because long repeat count occurs.The inventor has increased efficient for inapplicable those text zones of copy command.To specifically describe those MS orders below and how increase compression efficiency.
At first, similar with the front, three bit manipulation sign indicating numbers sign MS order.First opcode bits (0) shows that this order is not to make the pixel order.Two (11) subsequently are the making sequence command to this command id.Calling the opportunity of MS order discerns through four pixels of encoder anticipatory analysis.The technical staff should be noted that copy command does not need anticipatory analysis operation (but for additional function is provided, yet can increase the anticipatory analysis operation).Perhaps, through the MS order, pixel more or less can be used for this anticipatory analysis operation.Can see that the pixel quantity in the anticipatory analysis should be selected as on strategy: (1) is big that sufficient to guarantee repeat count coding can be more not efficient, and (2) are short as to be enough to make the MS order suitably available, and (3) value is for adapting to the integer of used word length.Be merely among this paper for example, described four pixels.When encoder confirms in four pixels subsequently to occur following two kinds of conditions, call the MS order: (1) CO, CL or CA order will can not be fit to, and (2) all pixels in those back four pixels be restricted to two kinds not homochromy." expansion " MS order expansion MS operation shown in the instance among Fig. 9 and Figure 10 comprises command code but have only in first byte on the throne 5,6,7.Further describe expansion MS order below.
As noted earlier, the MS order is used for a series of pixels as two kinds of not homochromy combinations.Be included in two kinds of colors in the set of available look and be near the color (color 0) of front pixel and from the color (color 1) of the nearest different color pixels before it.Certainly also can from variety of option, be adopted as other method of two kinds of pixel colors of MS command id, comprising the strictness sign of color, from present frame or former frame the selected location sign, from the look-up table sign of 2-look collection etc.In a preferred embodiment, two kinds of colors are derived from two kinds of different color pixels near the front, and they possibly adopt and make pixel, duplicate the top, duplicate the left side or duplicate old order and encode.The MS order is indifferent to these two kinds of pixels and how is obtained, and is concerned about that just they will become two kinds of colors of a series of pixels of the MS order that is about to appearance.
The MS order of the above-mentioned 2-of having look collection is favourable, because it does not require the byte with any color identification position.That is to say the MS order does not comprise the position of which color of sign use, which is used for the position of this sequence in two kinds of colors that identify previous sign and have only.Therefore; For example; When encoder arrived the beginning of certain text, the upper left corner of black letters " H " on the for example white background, first pixel in the upper left corner of " H " can be ordered through the CL (duplicating the left side) that follows several pixels after black MP (making pixel) order and defined.When the anticipatory analysis through encoder finds the top center of H and when upper right, encoder will be created and make sequence command, because it only detects two kinds of colors (text and background) of pixel on the horizon.
As shown in Figure 9, a MS command byte has three bit manipulation sign indicating numbers, follows afterwards to show that this order is expanded " expansion " position (in bit position 4) of next byte.If extension bits is zero, then not expansion of MS order, it finishes after first byte.In this case, four " C " position in that byte provides two colored patterns of four pixels, and current sequence finishes then.But if extension bits is launched, then another complete bytes of MS data will be followed current byte.Therefore, in Fig. 9, second byte is " explosion command " byte.Because extension bits appears in the last byte, therefore, next byte need not comprise three bit manipulation sign indicating numbers.Therefore, the sign of explosion command is not from the command code in the current byte, but from the extension bits in the last byte.This result is that each byte after first byte provides seven that make sequence data.Each explosion command byte comprises the extension bits (in bit position 7) of itself, and whether its next byte of sign is extended byte.As long as the E position is launched, then this expansion can continue.When cancelled the E position, current sequence stopped.The sequence of Figure 10 representes to define the instance of 13 byte long MS order of the sequence of 88 contiguous pixels.
When decoder received making sequence byte, it began to create the used pixel of client screen immediately, is described below.After read opcode 011, decoder is recognized, makes sequence and begins.It reads in the color of preceding pixel, and is " color 0 " to this color definition.Then, it reads the nearest different color pixels before it, and is this color definition " color 1 ".
Then, decoder reads the E position, is a byte or multibyte more so that confirm this sequence.At last, decoder reads a 0-3 in order, and from two available color, creates pixel according to the binary condition of each pixel.For first byte, decoder will be created four pixels.For example, if a MS byte is 01110110, and color 0 is white for black color 1, then decoder will create black, white, white, deceive four pixels (0110).Then, because the E position is set to 1, so decoder will notice that next byte is to create other seven black and white pixels.
In a preferred embodiment, first byte of MS order is created four pixels (eight deduct three opcode bits and deduct an extension bits).If encoder is found in sequence, to exist less than four pixels (promptly in back four pixels, having two or more colors), then the MS order can't be used for this preferred embodiment.In addition, if use first extended byte (second add up byte) of MS order, then encoder must analyze in advance and find that back seven contiguous pixels are suitable for MS state (promptly all select from two looks only, and do not have copy command to be suitable for).Then, as shown in Figure 9, preceding four pixels of four C bit-identify 11-pixel sequence in first byte, and back seven pixels in seven C bit-identify 11-pixel sequence in second byte.After this, only when the integral multiple of seven pixels can be added in the sequence, just use new MS extended byte.Therefore, as noted earlier, encoder " anticipatory analysis " before to any MS command byte coding, so that: (1) confirms whether preceding four pixels are suitable for MS and handle, and (2) confirm whether the extra byte of seven pixels is fit to.
Will appreciate that now the MS order utilizes sequential bits to come the definition of order pixel, make each corresponding to each pixel for color 0 or color 1.In fact, the C position of MS order is similar with pixel column.
As noted earlier, the encoder in the MS pattern carries out anticipatory analysis all the time, and the E position is not set, and fills back seven of next explosion command byte only if its finds in pixel sequence on the horizon, to have enough pixels.If encoder carries out anticipatory analysis and in back seven pixels, runs into the color that is different from 2-look collection, then finish to make sequence command (writing position of rest the E position of current byte) for current byte.
In one embodiment, encoder compares to the complete order type all pixels in institute if having time.In this case, these carry out more concurrently, and carry out to all orders all the time.When its own applicability of one of command type identification, encoder to it label also (according to other comparison and the priority between ordering) confirm that which command type is best to present case.For example, in the embodiment of Fig. 2, video compressor 23 is searched in five command types each applicability for each single pixel, and according to MS order request anticipatory analysis.
The foregoing description appears inapplicable the first time on screen for photo, because photo requires the making pixel MP order of larger amt.Before picture was sent out once, encoder was not created many copy commands, and this can create better efficient.Certainly, after picture sends to client computer at first, encoder will produce the CO order for those parts of the screen of subsequent frame.Though current embodiment not too is applicable to photographic intelligence, many therein vertical and horizontal lines usually are suitable in the application of computer console screen that copy command and screen comprise a large amount of texts additional efficiency being provided.
The embodiments of the invention that are called 7 gradation preference color modes provide makes the novelty and creative use of pixel (MP) order to color and gray-scale intensity table.This pattern is intended to obtain peak performance from 7 payloads of byte MP order.As shown in Figure 11, the strength range of each input color (red, green and blue) is in any position from 0 (the darkest) to 255 (the brightest).Some active computer control desk color depth minimizing schemes adopt altogether six to define whole colors (two provide for redness; Two provide for blueness; Two provide for green), produce four different red color tones, four different blue casts and four different green hue.4 3Individually be combined as 64 kinds of possible color scheme.
Grey also is important in computer application, and by wherein R, G and B respectively constitute with what equal intensities existed.Above-mentioned six color schemes provide four kinds of possible gray tones under default situation.Though four tones of R, G and B can provide the acceptable color depth, the gray tone of limited quantity proof is not enough for the gray scale degree of depth.
In example embodiment (but not being restrictive), number of colours rises to and surpasses 64, also increases the ratio bigger than color recruitment to gray tone quantity simultaneously.For this reason, " the use popularization degree " of all colors (comprising grey) waits and distributes according to set, the pre-color selected works of any computer console screen, and thus, frequency meter which color of sign (and gray scale) is considered to the most general.In Figure 11, binary system and decimal system strength grade (0-255) are illustrated in left hurdle, follow " use popularization degree " ranking afterwards.In this hurdle, lines are long more, and then the sort of color is many more by sign in normatron screen pond.As shown in the figure, zero intensity commonly used, commonly used 63 and 64, commonly used 127 and 128, commonly used 191 and 193, commonly used 255.
The inventor finds that on the normatron screen, grey is more general than non-grey.For example, scroll bar is a grey, and tool bar is a grey, and when pressing " button ", the edge of button becomes different gray tone.Black and white is a gray tone, and the utmost point uses continually.Computer screen uses many different gray tones, and the tone kind is important for contrast.When deducting color depth for the video compression purpose, first of suffering damage of video quality is on gray scale.When it produced, actual color was comparatively inessential.For example, the degree of the degree of redness or green is comparatively inessential.But, when the gray scale degree of depth reduces scheme through color depth and during cancellation, the important contrast when for example on screen, " pressing the button " is lost.
Through checking the popularization degree of color, through for each R, G and B provide five tones, and through searching code position to add more gray scales, present embodiment provides the excellent color contrast required whole colors, increases good gray level contrast simultaneously.At first, select one group of red, green and blue intensity commonly used.For the instance among Figure 11, each one of can five the most frequently used intensity occurs in red, green and basket: 0,64,128,192 and 255.They become five different tones that offer each color, i.e. five kinds of red color tones, five kinds of green hue and five kinds of blue casts.Utilize those five kinds of available colors of tone to add up to: 5 3=125.In these 125 kinds of colors, will occur five kinds of gray tones automatically, and be specially: (1) R, G and B equal 0, and (2) R, G and B equal 64, or the like.Five kinds of gray scales are superior to four kinds, but still fall flat.
For this reason, additional gray scale may be encoded as pixel coder and " hides " zone.As shown in Figure 4, the MP order defines red, green and blue intensity through seven.128 states (2 7) can define by these 7, still, utilize the above-mentioned five colors to transfer the popular colour scheme, only identify 125 kinds of colors.This instance adopts three kinds of states of residue (128 subtract 125) to be used for three additional gray scale levels.At this moment, replace five gray tones (RGB=0,64,128,192 and 255), (RGB=96,160 and 224) included three additional gray tones.Eight kinds of gray scales have been represented in the rightest hurdle of Figure 11.
Figure 12 is the colour print part of the test pattern (being called 0-255 RGB+ gray scale test pattern) on the video screen of computer that is 24 colors settings.Test pattern has the horizontal bar of pure red, pure green and ethereal blue, is increased to 255 (the brightest) from zero (the darkest).It also has pure grey bar (equivalent red, green and blue), is increased to 255 from zero.Figure 13 is the colour print part of gained client screen when to adopt " 7 gradation preference color modes " embodiment of the present invention and source video be test pattern shown in Figure 12.At last, 7 gradation preference color modes accurately show most popular five kinds of red, green and blue casts, and provide than the technical staff from 7 desired more tonal gradations.
Compare with six color schemes of prior art, 7 gradation preference color modes provide better chromaticity, and wherein gray scale number becomes twice (eight pairs four).7 high therein color depths of gradation preference color mode are not to have special applications in the crucial computer realm, and in field of network management, have more special applications.The network manager usually safeguards near the not server the keeper.The keeper still needs access server, and with the server real-time, interactive.It is important after keyboard or mouse input, letting video arrive the network manager as early as possible from server.And it is unacceptable returning video or catch up with the prior art video scheme that keyboard and mouse import too lentamente with the color of extreme difference or gray scale quality.This compressibility with 7 gradation preference color modes provides excellent chromaticity and extra gray scale quality for the network manager of the good video of the function aspects that needs computer interface (button, bar etc.).
In another embodiment of the present invention, color depth comes dynamically to increase or reduce according to source video content and/or network bandwidth availability.Video compression encoder will be notified client computer, and the length of MP order is increased or reduces, and other all orders will keep identical.Owing to the MP order is lowest priority and less appearance, therefore for each MP order, expanding to two or more bytes can obviously not increase the use Internet traffic that most of computer screen produced.Check image, will increase the quantity of MP order and increase difference like photo.Test shows is increased to two bytes to MP order from a byte and only lets the traffic on the normatron screen increase by 30%.
In another embodiment of the present invention, can make Internet traffic reduce to minimum through when the source video from the former frame of being sent changes, not sending data.In this embodiment, recognize when encoder 26 and need not send order when not changing, because when client computer 11 does not receive order, client screen is not changed under the default situation.In another alternative, afterwards, server software sends message to client computer in certain period (for example one minute), lets client computer 11 know the still effective and no change of screen of connection.
In Fig. 1 and the described embodiment of Fig. 2, the source video is from video creation software that all is arranged in destination server 15 and Video Controller chip.Another example embodiment is to let the source video from the video creation software and the Video Controller chip that integrate with video compressor.An instance of this " embedded " fully integrated system has been described among Figure 14.
Another alternative is to adopt the software of direct and video creation software interface to come compressed video (utilizing the video commands of above-mentioned same type) fully, has eliminated the needs to the Video Controller chip.The instance of this pure software " no controller " embodiment has been described among Figure 15.
In the example embodiment in front, command decoder is realized through PC software.An alternative adopts hardware fully or adopts the combination of the small micro of hardware and low-cost low performance to realize decoder.This " embedded " decoder will directly be exported its video (not having PC or Video Controller chip) to video display, and will be shown in figure 16.This " little client computer " also can comprise keyboard and mouse interface circuit, and can be integrated in the video display.Little client computer is applicable to hopes to let all staff on board's computer leave main service area and stay in the application in the machine room.In the service area, have only keyboard, monitor and mouse to occur on the table.When the staff when a position moves to another position, they can be from any its computer of little client logon (other any computer that perhaps allows them to get into).
To Figure 17 another exemplified aspect of the present invention is described below.If added second client computer 16 (identical) that also has same client machine software and also be connected to IP network with client computer 11; Then server apparatus 14 can send same video compression order to two client computer, allows the visit of two client computer whiles " sharing " to destination server 15.Usually, in this " shared model ", the positive access server 15 of client computer, and another client computer is watched.When client computer 11 was just being used server and run into certain operating mistake that client user hopes that network manager's (being in another position) checks, this instance can take place.This is called " Help Desk " pattern.At video is under the situation of multicast, and one group of trainee for taking a seat at a plurality of respective client remote consoles 17 and 18 adopts this shared model to a greater degree.
In the shared model through internet (especially having a large amount of while users), it is favourable adopting UDP communication rather than TCP communication.The technical staff will appreciate that UDP adopts does not have the datagram of affirmation, and the tcp data newspaper is identified.A large amount of affirmations of shared model user simultaneously pour in and possibly be full of server apparatus.The advantage of TCP is because all data are sent out also loopback up to being identified, therefore do not have loss of data.But, for video, the content that the less care of user is lost, and more care continuous videos stream.In other words, only, and do not mean that the user hopes that video turns back to the frame of being lost and restarts because screen glimmers because of lost frames.The present invention can be used with TCP, UDP or other any affirmation or agreement unconfirmed.
The applicant notices that the shortcoming of udp protocol is that they can help the refusal in the service attacks of malice appearance on the internet.Because UDP does not have to confirm, so the traffic possibly be full of server with UDP datagram.In order to prevent this situation, fire compartment wall usually blocks UDP.In adopting the example embodiment of UDP, use the present invention to require to accept UDP datagram, still, classroom environment and be used for a large amount of shared model users other use the equipment that is in usually after the fire compartment wall.
In yet another embodiment, data encryption is applied to the video compression order, the danger that the feasible compress machine screen that is transmitted is not kept watch on.Can adopt any encryption technology, still,, the encryption technology that can in same video compressor reducer 23, realize, encrypt than data encryption device independently like AES and more to suit the requirements with video compression coding from the viewpoint that realizes.
The combination of the mentioned order structure that the inventor proposes to combine with 7 gradation preference color schemes is as preferred embodiment, because the computer administrator's that this combination is the utmost point to be suitable in KVM type servers management environment, working the best mode of trading off.Rearranging the command operation sign indicating number can reduce network bandwidth requirement or increase the color depth that is used for other environment with the change color scheme.
For example; If have only five color positions to be used for realizing 5 gradation preference color modes shown in figure 18; Then the swap operation sign indicating number is favourable between MS order and MP order, and is shown in figure 19, because single bit manipulation sign indicating number is " waste " in the MP order that only has five P positions.In this embodiment, single bit manipulation sign indicating number is used for strengthening the efficient of MS order better.It has also eliminated the needs for MS order extension bits (E position), can expand the MS order because only send follow-up MS order, like Figure 20 and shown in Figure 21.This alternative combinations of imperative structures and 5 colors provides less color depth for the screen with a large amount of texts, but has improved performance (because more efficient MS order), and still, it provides the gray scale number (8) identical with above-mentioned 7 color modes.
Adopt the identical alternate arrangements of command code shown in Figure 19 for another embodiment that requires the more application of the polychrome degree of depth to carry out optimizing, but the MP order is one or two byte longs, like Figure 22, shown in 23 and 24.When it was two byte longs, it provides 12 colors (4 red, 4 green and 4 indigo plants), and was shown in figure 23.When it was a byte long, it provides 4 payloads of 16 gray tones of definition (red, green and blue all equal), and was shown in figure 24." A " position among Figure 22 (or " owning " position) shows that all three kinds of colors are equal to the value of " P " position, and order is limited to a byte.In fact, elongated MP order is for gradation preference, because from byte gray scale order, produce less Internet traffic.In another embodiment, 4 payloads of byte MP order are represented 16 popular colours rather than 16 gray scales.16 popular colours can be confirmed through the nearest usage statistics of MP order or through the tabulation of presetting of 16 kinds of popular colours.In addition, the same advantage of the more effectively MS order in above-mentioned 5 color modes is included in these 12 color modes.The close similitude of 5 and 12 color modes described here allow an embodiment according to source video content and/or available network bandwidth 5 with 12 colors between dynamically switching.For the improvement performance in other application or other environment, it also is favourable being expressed as with those that other that adopt 5 orders similar with 12 color modes rearrange.
Though in conjunction with thinking that at present the most feasible and preferred embodiment describe the present invention; But be appreciated that; The invention is not restricted to the disclosed embodiments, on the contrary, it is intended to contain essence and interior various modifications and the equivalents of scope that is contained in accompanying claims.

Claims (1)

1. method of compressing the fixed bit rgb video comprises:
Reduce the quantity available of different pixels color through following steps:
Be grouped into the predetermined strength red, green and blue component of each pixel color in each intensity region;
Naturally the more gray-scale intensity of creating when interpolation all is in mutually the same said intensity region than said red, green and blue component, and;
The color that predetermined strength red with utilizing, green and blue component obtains and the gray-scale intensity of said interpolation are as the final pixel color that uses.
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Families Citing this family (113)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091850A1 (en) 1992-10-23 2002-07-11 Cybex Corporation System and method for remote monitoring and operation of personal computers
US5721842A (en) * 1995-08-25 1998-02-24 Apex Pc Solutions, Inc. Interconnection system for viewing and controlling remotely connected computers with on-screen video overlay for controlling of the interconnection switch
WO2003102868A2 (en) * 2002-05-29 2003-12-11 Pixonics, Inc. Classifying image areas of a video signal
US7818480B2 (en) * 2002-08-29 2010-10-19 Raritan Americas, Inc. Wireless management of remote devices
US8068546B2 (en) * 2002-08-29 2011-11-29 Riip, Inc. Method and apparatus for transmitting video signals
US8558795B2 (en) * 2004-03-12 2013-10-15 Riip, Inc. Switchless KVM network with wireless technology
US7606314B2 (en) * 2002-08-29 2009-10-20 Raritan America, Inc. Method and apparatus for caching, compressing and transmitting video signals
US7684483B2 (en) * 2002-08-29 2010-03-23 Raritan Americas, Inc. Method and apparatus for digitizing and compressing remote video signals
JP4601895B2 (en) * 2002-09-26 2010-12-22 富士通コンポーネント株式会社 Switching device and computer system
US7321623B2 (en) * 2002-10-01 2008-01-22 Avocent Corporation Video compression system
US20060126718A1 (en) * 2002-10-01 2006-06-15 Avocent Corporation Video compression encoder
US20040215742A1 (en) * 2003-03-04 2004-10-28 Soronti, Inc. Image perfection for virtual presence architecture (VPA)
US20040221009A1 (en) * 2003-03-04 2004-11-04 Soronti, Inc. Keyboard-video-mouse (KVM) loop back configuration for virtual presence architecture (VPA)
US7580380B2 (en) * 2003-05-28 2009-08-25 Artimi Ltd Communications systems and methods
US9560371B2 (en) * 2003-07-30 2017-01-31 Avocent Corporation Video compression system
US7362355B1 (en) * 2003-08-04 2008-04-22 Pixim, Inc. Digital CMOS image sensor incorporating a programmable multi-functional lookup table
US7430329B1 (en) 2003-11-26 2008-09-30 Vidiator Enterprises, Inc. Human visual system (HVS)-based pre-filtering of video data
US7809061B1 (en) * 2004-01-22 2010-10-05 Vidiator Enterprises Inc. Method and system for hierarchical data reuse to improve efficiency in the encoding of unique multiple video streams
US7853663B2 (en) * 2004-03-12 2010-12-14 Riip, Inc. Wireless management system for control of remote devices
JP4451181B2 (en) * 2004-03-26 2010-04-14 オリンパス株式会社 Image compression method and image compression apparatus
TWI241492B (en) * 2004-05-13 2005-10-11 Sunplus Technology Co Ltd Method and chips being able to expand I/O pins of chip
US7006700B2 (en) * 2004-06-25 2006-02-28 Avocent Corporation Digital video compression command priority
US7457461B2 (en) * 2004-06-25 2008-11-25 Avocent Corporation Video compression noise immunity
US8442311B1 (en) 2005-06-30 2013-05-14 Teradici Corporation Apparatus and method for encoding an image generated in part by graphical commands
US7747086B1 (en) 2005-07-28 2010-06-29 Teradici Corporation Methods and apparatus for encoding a shared drawing memory
US7403204B2 (en) * 2004-08-23 2008-07-22 Hewlett-Packard Development Company, L.P. Method and apparatus for managing changes in a virtual screen buffer
US7574059B2 (en) * 2004-10-29 2009-08-11 Broadcom Corporation System, method, and apparatus for providing massively scaled down video using iconification
US7228154B2 (en) * 2004-11-03 2007-06-05 Sony Corporation Method and system for processing wireless digital multimedia
US20060119602A1 (en) * 2004-12-07 2006-06-08 Fisher Andrew J Address based graphics protocol
US7430681B1 (en) 2005-03-30 2008-09-30 Teradici Corporation Methods and apparatus for interfacing a drawing memory with a remote display controller
US8560753B1 (en) 2005-03-30 2013-10-15 Teradici Corporation Method and apparatus for remote input/output in a computer system
US7516255B1 (en) 2005-03-30 2009-04-07 Teradici Corporation Method and apparatus for providing a low-latency connection between a data processor and a remote graphical user interface over a network
WO2006105743A1 (en) * 2005-04-08 2006-10-12 Firma Pepperl + Fuchs Gmbh Thin-client terminal and client/server-system having such a terminal
US7640382B2 (en) * 2005-04-29 2009-12-29 Avocent Corporation Virtual media systems, methods and devices
CN1332300C (en) * 2005-04-30 2007-08-15 广东威创日新电子有限公司 Remote display processing method based on server end/client end structure
JP2007034376A (en) * 2005-07-22 2007-02-08 Fujitsu Component Ltd Switch device, its control method and control program
US8345768B1 (en) 2005-07-28 2013-01-01 Teradici Corporation Progressive block encoding using region analysis
US8107527B1 (en) 2005-07-28 2012-01-31 Teradici Corporation Progressive block encoding using region analysis
US7822278B1 (en) 2005-09-20 2010-10-26 Teradici Corporation Methods and apparatus for encoding a digital video signal
US7634076B2 (en) * 2005-08-03 2009-12-15 Indicium Media, Llc Network, system and method for distributing digital media
US7230560B2 (en) * 2005-08-05 2007-06-12 Microsoft Corporation Image compression and decompression
US7817849B2 (en) * 2005-08-18 2010-10-19 Hewlett-Packard Development Company, L.P. Method and apparatus for graphical data compression
US8478884B2 (en) * 2005-09-30 2013-07-02 Riip, Inc. Wireless remote device management utilizing mesh topology
US7752339B2 (en) * 2005-10-11 2010-07-06 Aten International Co., Ltd. Matrix architecture for KVM extenders
US20060053212A1 (en) * 2005-10-28 2006-03-09 Aspeed Technology Inc. Computer network architecture for providing display data at remote monitor
US7555570B2 (en) * 2006-02-17 2009-06-30 Avocent Huntsville Corporation Device and method for configuring a target device
US7689677B2 (en) * 2006-02-17 2010-03-30 Avocent Huntsville Corporation Dynamic power cycling
US8718147B2 (en) * 2006-02-17 2014-05-06 Avocent Huntsville Corporation Video compression algorithm
US20070261116A1 (en) * 2006-04-13 2007-11-08 Verisign, Inc. Method and apparatus to provide a user profile for use with a secure content service
CA2650663A1 (en) * 2006-04-28 2007-11-08 Avocent Corporation Dvc delta commands
WO2008097273A1 (en) * 2006-08-10 2008-08-14 Avocent Huntsville Corporation Usb based virtual media system
US20080040527A1 (en) * 2006-08-14 2008-02-14 Filipov Metodi N Management module
US20080062121A1 (en) * 2006-09-08 2008-03-13 Aten Interational Co., Ltd. Shuttle control system for controlling kvm switch and method thereof
JP4946399B2 (en) * 2006-11-30 2012-06-06 カシオ計算機株式会社 Image processing apparatus and program
CN101652993B (en) * 2007-03-29 2014-02-19 汤姆森特许公司 Method and apparatus for content distribution to and playout with a digital cinema system
JP5137499B2 (en) * 2007-08-24 2013-02-06 富士通コンポーネント株式会社 KVM switch and control method thereof
US8411740B2 (en) * 2007-09-10 2013-04-02 Ncomputing Inc. System and method for low bandwidth display information transport
US8954876B1 (en) * 2007-10-09 2015-02-10 Teradici Corporation Method and apparatus for providing a session status indicator
US8203573B1 (en) * 2007-12-17 2012-06-19 Nvidia Corporation Systems and methods for assembling image data for transmission across a digital video interface
GB2459684A (en) * 2008-04-30 2009-11-04 British Broadcasting Corp Television Signal having high frame rate
WO2010014973A1 (en) * 2008-08-01 2010-02-04 Real D Method and apparatus to mark and identify stereoscopic video frames
WO2010017166A2 (en) 2008-08-04 2010-02-11 Dolby Laboratories Licensing Corporation Overlapped block disparity estimation and compensation architecture
JP4883226B2 (en) * 2009-01-23 2012-02-22 日本電気株式会社 Video descriptor generator
US20100226441A1 (en) * 2009-03-06 2010-09-09 Microsoft Corporation Frame Capture, Encoding, and Transmission Management
US8385338B2 (en) * 2009-04-24 2013-02-26 Futurewei Technologies, Inc. Implementation to avoid the acknowledgement-implosion in a multicast group
US20110191810A1 (en) * 2010-02-01 2011-08-04 Thomas Christopher L Method and System for Distribution of Computer and Entertainment Information
TWI395490B (en) * 2010-05-10 2013-05-01 Univ Nat Central Electrical-device-implemented video coding method
US20120106650A1 (en) * 2010-08-24 2012-05-03 Siegman Craig S Method and System for Block and DVC Compression
WO2012027354A1 (en) * 2010-08-24 2012-03-01 Avocent Corporation Method and system for block and dvc video compression
US8968080B1 (en) 2010-11-05 2015-03-03 Wms Gaming, Inc. Display of third party content on a wagering game machine
US8639053B2 (en) * 2011-01-18 2014-01-28 Dimension, Inc. Methods and systems for up-scaling a standard definition (SD) video to high definition (HD) quality
DK2673585T3 (en) 2011-02-08 2019-03-25 Carrier Corp HARDWOOD PLATE HEAT EXCHANGE FOR WATER COOLED HEAT REJECTION IN COOLING CYCLE
US9578336B2 (en) 2011-08-31 2017-02-21 Texas Instruments Incorporated Hybrid video and graphics system with automatic content detection process, and other circuits, processes, and systems
CN102710935A (en) * 2011-11-28 2012-10-03 杭州华银教育多媒体科技股份有限公司 Method for screen transmission between computer and mobile equipment through incremental mixed compressed encoding
CN103186544B (en) * 2011-12-28 2017-11-14 广东新岸线计算机系统芯片有限公司 A kind of color bits depth access method and system
US8897586B2 (en) * 2012-06-15 2014-11-25 Comcast Cable Communications, Llc Dynamic generation of a quantization matrix for compression of a digital object
WO2014085542A1 (en) * 2012-11-28 2014-06-05 Duquesne University Of The Holy Spirit A method of detecting steganographically hidden images via low-order bit comparisons
US9116866B2 (en) 2013-08-21 2015-08-25 Seven Bridges Genomics Inc. Methods and systems for detecting sequence variants
US9898575B2 (en) 2013-08-21 2018-02-20 Seven Bridges Genomics Inc. Methods and systems for aligning sequences
AU2014337093B2 (en) 2013-10-18 2020-07-30 Seven Bridges Genomics Inc. Methods and systems for identifying disease-induced mutations
US10832797B2 (en) 2013-10-18 2020-11-10 Seven Bridges Genomics Inc. Method and system for quantifying sequence alignment
WO2015058120A1 (en) 2013-10-18 2015-04-23 Seven Bridges Genomics Inc. Methods and systems for aligning sequences in the presence of repeating elements
CN105793689B (en) 2013-10-18 2020-04-17 七桥基因公司 Methods and systems for genotyping genetic samples
US9092402B2 (en) 2013-10-21 2015-07-28 Seven Bridges Genomics Inc. Systems and methods for using paired-end data in directed acyclic structure
US9584701B2 (en) * 2014-01-06 2017-02-28 Panamorph, Inc. Image processing system and method
US11350015B2 (en) 2014-01-06 2022-05-31 Panamorph, Inc. Image processing system and method
KR102120865B1 (en) * 2014-01-14 2020-06-17 삼성전자주식회사 Display Device, Driver of Display Device, Electronic Device including thereof and Display System
WO2015177804A1 (en) 2014-05-19 2015-11-26 Ramesh Rajagopal A leverage assembly for energy generation
EP3021583B1 (en) * 2014-11-14 2019-10-23 Axis AB Method of identifying relevant areas in digital images, method of encoding digital images, and encoder system
US10275567B2 (en) 2015-05-22 2019-04-30 Seven Bridges Genomics Inc. Systems and methods for haplotyping
US10793895B2 (en) 2015-08-24 2020-10-06 Seven Bridges Genomics Inc. Systems and methods for epigenetic analysis
US10724110B2 (en) 2015-09-01 2020-07-28 Seven Bridges Genomics Inc. Systems and methods for analyzing viral nucleic acids
US10584380B2 (en) 2015-09-01 2020-03-10 Seven Bridges Genomics Inc. Systems and methods for mitochondrial analysis
US11347704B2 (en) 2015-10-16 2022-05-31 Seven Bridges Genomics Inc. Biological graph or sequence serialization
CN105469772A (en) * 2015-12-30 2016-04-06 广东威创视讯科技股份有限公司 Remote KVM (Keyboard Video Mouse) control method, remote KVM control terminal and system
US10364468B2 (en) 2016-01-13 2019-07-30 Seven Bridges Genomics Inc. Systems and methods for analyzing circulating tumor DNA
US10460829B2 (en) 2016-01-26 2019-10-29 Seven Bridges Genomics Inc. Systems and methods for encoding genetic variation for a population
CN106028029B (en) * 2016-05-25 2018-11-06 杭州比特瑞旺电脑有限公司 The digital KVM switcher video lossless compression method and system of low delay low complex degree
CN106101703B (en) * 2016-06-20 2018-11-06 杭州比特瑞旺电脑有限公司 A kind of screen video compression method towards digital KVM switcher
US11250931B2 (en) 2016-09-01 2022-02-15 Seven Bridges Genomics Inc. Systems and methods for detecting recombination
CN106713922B (en) * 2017-01-13 2020-03-06 京东方科技集团股份有限公司 Image processing method and electronic device
CN107124613B (en) * 2017-06-27 2020-08-14 洛阳市气象局 Method for recoding second-class product data of Doppler weather radar
US20210058629A1 (en) 2018-05-09 2021-02-25 Hfipix, Inc. Image processing system and method
US10796621B2 (en) * 2018-09-14 2020-10-06 Chongqing Hkc Optoelectronics Technology Co., Ltd. Method for processing data, display device and computer readable storage medium
CN109640065A (en) * 2018-10-26 2019-04-16 深圳市华星光电技术有限公司 A method of for picture data processing
US11165559B2 (en) 2019-01-07 2021-11-02 International Business Machines Corporation Machine learning based video compression
CN111757168B (en) * 2019-03-29 2022-08-19 腾讯科技（深圳）有限公司 Audio decoding method, device, storage medium and equipment
IL265789A (en) 2019-04-01 2020-10-28 Fibernet Ltd Device for secure video streaming
IL266118B2 (en) 2019-04-17 2023-08-01 Fibernet Ltd Device for secure unidirectional audio transmission
WO2023014815A1 (en) 2021-08-03 2023-02-09 Vertiv It Systems, Inc. Dvcx and dvcy extensions to dvc video compression
US11968409B2 (en) 2022-04-26 2024-04-23 Pinterest, Inc. Intelligent video playback
CN115022628B (en) * 2022-08-04 2022-12-13 之江实验室 JPEG-LS (joint photographic experts group-LS) -based high-throughput lossless image compression method
CN116469336B (en) * 2023-06-20 2023-08-18 联士光电（深圳）有限公司 Digital driving method for color micro-display chip

Family Cites Families (207)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630532A (en) * 1947-07-14 1953-03-03 Patelhold Patentverwertung Directed beam antenna system
US3710011A (en) * 1970-12-04 1973-01-09 Computer Image Corp System for automatically producing a color display of a scene from a black and white representation of the scene
US3925762A (en) 1973-10-25 1975-12-09 Gen Electric Patient monitoring and data processing system
US3935379A (en) 1974-05-09 1976-01-27 General Dynamics Corporation Method of and system for adaptive run length encoding of image representing digital information
US4005411A (en) 1974-12-30 1977-01-25 International Business Machines Corporation Compression of gray scale imagery to less than one bit per picture element
JPS5816667B2 (en) 1976-07-21 1983-04-01 ケイディディ株式会社 Interline encoding method for facsimile signals
MX4130E (en) * 1977-05-20 1982-01-04 Amdahl Corp IMPROVEMENTS IN DATA PROCESSING SYSTEM AND INFORMATION SCRUTINY USING CHECK SUMS
US4384327A (en) 1978-10-31 1983-05-17 Honeywell Information Systems Inc. Intersystem cycle control logic
FR2461405A1 (en) * 1979-07-09 1981-01-30 Temime Jean Pierre SYSTEM FOR CODING AND DECODING A DIGITAL VISIOPHONE SIGNAL
US4764769A (en) 1983-10-19 1988-08-16 Vega Precision Laboratories, Inc. Position coded pulse communication system
FI842333A (en) 1984-06-08 1985-12-09 Valtion Teknillinen Tutkimuskeskus FOERFARANDE FOER IDENTIFIERING AV DE MEST FOERAENDRADE BILDOMRAODENA I LEVANDE VIDEOSIGNAL.
CA1287161C (en) * 1984-09-17 1991-07-30 Akihiro Furukawa Apparatus for discriminating a moving region and a stationary region in a video signal
JPS6277935A (en) 1985-10-01 1987-04-10 Morisawa:Kk Drawing device of type photo-composing machine
JPS63108879A (en) 1986-10-25 1988-05-13 Nippon Telegr & Teleph Corp <Ntt> Video encoding transmission equipment
CA1283962C (en) 1986-12-08 1991-05-07 Gerald F. Youngblood Apparatus and method for communication between host cpu and remote terminal
ZA883232B (en) 1987-05-06 1989-07-26 Dowd Research Pty Ltd O Packet switches,switching methods,protocols and networks
US4774587A (en) 1987-06-02 1988-09-27 Eastman Kodak Company Still video transceiver processor
JPH0695727B2 (en) * 1987-09-18 1994-11-24 富士通株式会社 Image data compression device
US4873515A (en) * 1987-10-16 1989-10-10 Evans & Sutherland Computer Corporation Computer graphics pixel processing system
JPH01162480A (en) 1987-12-18 1989-06-26 Sanyo Electric Co Ltd Method for encoding
JPH01303988A (en) 1988-06-01 1989-12-07 Hitachi Ltd Consecutive picture coding method and decoding method and encoder and decoder
US5136717A (en) 1988-11-23 1992-08-04 Flavors Technology Inc. Realtime systolic, multiple-instruction, single-data parallel computer system
US4959833A (en) 1989-03-08 1990-09-25 Ics Electronics Corporation Data transmission method and bus extender
JPH034351A (en) 1989-04-26 1991-01-10 Dubner Computer Syst Inc System-bus-data-link device
JPH03130767A (en) 1989-10-16 1991-06-04 Brother Ind Ltd Pressure developing device
JPH03192457A (en) 1989-12-22 1991-08-22 Toshiba Corp Access control system
JP3092135B2 (en) 1990-03-13 2000-09-25 株式会社日立製作所 Application execution control method
US5046119A (en) * 1990-03-16 1991-09-03 Apple Computer, Inc. Method and apparatus for compressing and decompressing color video data with an anti-aliasing mode
JP2530466Y2 (en) 1990-04-13 1997-03-26 日本ケーブル株式会社 Automatic circulation type cableway acceleration and deceleration transfer device
US5083214A (en) 1990-05-02 1992-01-21 Eastman Kodak Company Apparatus and methods for extracting data from a scanned bit-mapped data strip
US5757973A (en) 1991-01-11 1998-05-26 Sony Corporation Compression of image data seperated into frequency component data in a two dimensional spatial frequency domain
DE69230922T2 (en) 1991-01-17 2000-11-30 Mitsubishi Electric Corp Video signal encoder with block exchange technology
KR930011971B1 (en) 1991-01-29 1993-12-23 삼성전자 주식회사 Color signal border sharpness compensation circuit
US5339164A (en) 1991-12-24 1994-08-16 Massachusetts Institute Of Technology Method and apparatus for encoding of data using both vector quantization and runlength encoding and using adaptive runlength encoding
JP3192457B2 (en) 1992-01-29 2001-07-30 バブコック日立株式会社 Non-consumable electrode arc welding method and apparatus
US5526024A (en) 1992-03-12 1996-06-11 At&T Corp. Apparatus for synchronization and display of plurality of digital video data streams
US5325126A (en) 1992-04-01 1994-06-28 Intel Corporation Method and apparatus for real time compression and decompression of a digital motion video signal
GB2267624B (en) 1992-05-05 1995-09-20 Acorn Computers Ltd Image data compression
US5408542A (en) 1992-05-12 1995-04-18 Apple Computer, Inc. Method and apparatus for real-time lossless compression and decompression of image data
US5664029A (en) 1992-05-13 1997-09-02 Apple Computer, Inc. Method of disregarding changes in data in a location of a data structure based upon changes in data in nearby locations
DE69327986T2 (en) 1992-06-03 2000-10-05 Koninkl Philips Electronics Nv System for automatic compensation of cable loss
US5430848A (en) 1992-08-14 1995-07-04 Loral Fairchild Corporation Distributed arbitration with programmable priorities
JPH06153180A (en) 1992-09-16 1994-05-31 Fujitsu Ltd Picture data coding method and device
US5732212A (en) 1992-10-23 1998-03-24 Fox Network Systems, Inc. System and method for remote monitoring and operation of personal computers
US5566339A (en) 1992-10-23 1996-10-15 Fox Network Systems, Inc. System and method for monitoring computer environment and operation
JPH06152970A (en) * 1992-11-02 1994-05-31 Fujitsu Ltd Picture compressing method and picture processor
US5572235A (en) * 1992-11-02 1996-11-05 The 3Do Company Method and apparatus for processing image data
GB2274224B (en) 1993-01-07 1997-02-26 Sony Broadcast & Communication Data compression
US5812534A (en) 1993-01-08 1998-09-22 Multi-Tech Systems, Inc. Voice over data conferencing for a computer-based personal communications system
US5563661A (en) 1993-04-05 1996-10-08 Canon Kabushiki Kaisha Image processing apparatus
US5537142A (en) 1993-10-20 1996-07-16 Videolan Technologies, Inc. Local area network for simultaneous, bi-directional transmission of video bandwidth signals, including a switching matrix which defines user connections, upstream connections, and downstream connections and has an efficient configuration to minimize the
JP3385077B2 (en) * 1993-10-28 2003-03-10 松下電器産業株式会社 Motion vector detection device
US5465118A (en) * 1993-12-17 1995-11-07 International Business Machines Corporation Luminance transition coding method for software motion video compression/decompression
US5664223A (en) 1994-04-05 1997-09-02 International Business Machines Corporation System for independently transferring data using two independently controlled DMA engines coupled between a FIFO buffer and two separate buses respectively
US6195391B1 (en) * 1994-05-31 2001-02-27 International Business Machines Corporation Hybrid video compression/decompression system
JPH0833000A (en) 1994-07-15 1996-02-02 Matsushita Electric Ind Co Ltd Method and device for video transmission
US5659707A (en) 1994-10-07 1997-08-19 Industrial Technology Research Institute Transfer labeling mechanism for multiple outstanding read requests on a split transaction bus
US6972786B1 (en) 1994-12-30 2005-12-06 Collaboration Properties, Inc. Multimedia services using central office
JPH08223579A (en) * 1995-02-13 1996-08-30 Hitachi Ltd Coder, decoder and communication equipment provided with the same
US5805735A (en) * 1995-03-02 1998-09-08 Apple Computer, Inc. Method and apparatus for compression of digitized image data using variable color fidelity
JPH08263262A (en) 1995-03-20 1996-10-11 Oki Data:Kk Compression method for printing data
EP0734175B1 (en) * 1995-03-20 2000-06-28 Daewoo Electronics Co., Ltd Hierarchical motion vector estimation using multiple block sizes
US5799207A (en) 1995-03-28 1998-08-25 Industrial Technology Research Institute Non-blocking peripheral access architecture having a register configure to indicate a path selection for data transfer between a master, memory, and an I/O device
DE19513105A1 (en) 1995-04-07 1996-10-10 Hell Ag Linotype Procedure for generating a contone map
US5586121A (en) 1995-04-21 1996-12-17 Hybrid Networks, Inc. Asymmetric hybrid access system and method
US6661838B2 (en) * 1995-05-26 2003-12-09 Canon Kabushiki Kaisha Image processing apparatus for detecting changes of an image signal and image processing method therefor
IL122260A (en) 1995-06-07 2001-01-11 Samsung Electronics Co Ltd Interface circuit between asynchronously operating buses
US5844940A (en) 1995-06-30 1998-12-01 Motorola, Inc. Method and apparatus for determining transmit power levels for data transmission and reception
US5793371A (en) * 1995-08-04 1998-08-11 Sun Microsystems, Inc. Method and apparatus for geometric compression of three-dimensional graphics data
US5764924A (en) 1995-08-24 1998-06-09 Ncr Corporation Method and apparatus for extending a local PCI bus to a remote I/O backplane
US5721842A (en) 1995-08-25 1998-02-24 Apex Pc Solutions, Inc. Interconnection system for viewing and controlling remotely connected computers with on-screen video overlay for controlling of the interconnection switch
US5754836A (en) 1995-09-21 1998-05-19 Videoserver, Inc. Split bus architecture for multipoint control unit
US5781747A (en) 1995-11-14 1998-07-14 Mesa Ridge Technologies, Inc. Method and apparatus for extending the signal path of a peripheral component interconnect bus to a remote location
US5712986A (en) 1995-12-19 1998-01-27 Ncr Corporation Asynchronous PCI-to-PCI Bridge
JPH09233467A (en) * 1996-02-21 1997-09-05 Fujitsu Ltd Image data communication equipment and communication data amount control method for image data communication system
JPH09321672A (en) 1996-03-29 1997-12-12 Fujitsu Ltd Line equalizer control method, integration circuit, frequency shift circuit and transmission equipment
US5675382A (en) 1996-04-08 1997-10-07 Connectix Corporation Spatial compression and decompression for video
US5898889A (en) 1996-04-30 1999-04-27 3Com Corporation Qualified burst cache for transfer of data between disparate clock domains
US5812169A (en) * 1996-05-14 1998-09-22 Eastman Kodak Company Combined storage of data for two printheads
US5870429A (en) 1996-06-17 1999-02-09 Motorola, Inc. Apparatus method, and software modem for utilizing envelope delay distortion characteristics to determine a symbol rate and a carrier frequency for data transfer
US5832520A (en) * 1996-07-03 1998-11-03 Miller, Call, Plauck And Miller Automatic file differencing and updating system
ATE236490T1 (en) 1996-07-31 2003-04-15 Matsushita Electric Ind Co Ltd IMAGE DECODER AND IMAGE DECODING METHOD
US5864681A (en) * 1996-08-09 1999-01-26 U.S. Robotics Access Corp. Video encoder/decoder system
US5764479A (en) 1996-09-23 1998-06-09 International Business Machines Corporation Split system personal computer having floppy disk drive moveable between accessible and inaccessible positions
US6084638A (en) 1996-10-08 2000-07-04 Hare; Charles S. Computer interface extension system and method
US6094453A (en) * 1996-10-11 2000-07-25 Digital Accelerator Corporation Digital data compression with quad-tree coding of header file
US5898861A (en) 1996-10-18 1999-04-27 Compaq Computer Corporation Transparent keyboard hot plug
US5990852A (en) 1996-10-31 1999-11-23 Fujitsu Limited Display screen duplication system and method
US5828848A (en) * 1996-10-31 1998-10-27 Sensormatic Electronics Corporation Method and apparatus for compression and decompression of video data streams
EP0844567A1 (en) 1996-11-21 1998-05-27 Hewlett-Packard Company Long haul PCI-to-PCI bridge
JP2001507880A (en) 1996-12-09 2001-06-12 ソネラ ユルキネン オサケユキチュア Video image transmission method
US5861764A (en) 1996-12-31 1999-01-19 Compaq Computer Corporation Clock skew reduction using spider clock trace routing
TW361051B (en) * 1997-01-09 1999-06-11 Matsushita Electric Ind Co Ltd Motion vector detection apparatus
JPH10215379A (en) 1997-01-30 1998-08-11 Fuji Xerox Co Ltd Image coder and image decoder
US5731706A (en) 1997-02-18 1998-03-24 Koeman; Henriecus Method for efficient calculation of power sum cross-talk loss
JPH10257485A (en) 1997-03-10 1998-09-25 Victor Co Of Japan Ltd Detection circuit for repetitive image and image coder
US5997358A (en) 1997-09-02 1999-12-07 Lucent Technologies Inc. Electrical connector having time-delayed signal compensation
AU7601498A (en) 1997-05-30 1998-12-30 Apex Inc. Video signal equalization system
US6134613A (en) 1997-06-16 2000-10-17 Iomega Corporation Combined video processing and peripheral interface card for connection to a computer bus
US6425033B1 (en) 1997-06-20 2002-07-23 National Instruments Corporation System and method for connecting peripheral buses through a serial bus
US6064771A (en) * 1997-06-23 2000-05-16 Real-Time Geometry Corp. System and method for asynchronous, adaptive moving picture compression, and decompression
US5967853A (en) 1997-06-24 1999-10-19 Lucent Technologies Inc. Crosstalk compensation for electrical connectors
EP1021884A2 (en) 1997-07-31 2000-07-26 Stanford Syncom Inc. Means and method for a synchronous network communications system
US6304895B1 (en) 1997-08-22 2001-10-16 Apex Inc. Method and system for intelligently controlling a remotely located computer
US5948092A (en) 1997-10-07 1999-09-07 International Business Machines Corporation Local bus IDE architecture for a split computer system
US6055597A (en) 1997-10-30 2000-04-25 Micron Electronics, Inc. Bi-directional synchronizing buffer system
EP0920216A1 (en) * 1997-11-25 1999-06-02 Deutsche Thomson-Brandt Gmbh Method and apparatus for encoding and decoding an image sequence
JPH11161782A (en) * 1997-11-27 1999-06-18 Seiko Epson Corp Method and device for encoding color picture, and method and device for decoding color picture
JPH11184801A (en) 1997-12-22 1999-07-09 Konica Corp Interface device and data processing system
US6240481B1 (en) 1997-12-22 2001-05-29 Konica Corporation Data bus control for image forming apparatus
JP4114988B2 (en) 1997-12-22 2008-07-09 コニカミノルタホールディングス株式会社 Data processing device
US6032261A (en) 1997-12-30 2000-02-29 Philips Electronics North America Corp. Bus bridge with distribution of a common cycle clock to all bridge portals to provide synchronization of local buses, and method of operation thereof
JP2885235B1 (en) * 1998-01-14 1999-04-19 日本電気株式会社 Data compression method and machine readable recording medium recording compression program
US6012101A (en) 1998-01-16 2000-01-04 Int Labs, Inc. Computer network having commonly located computing systems
US6829301B1 (en) 1998-01-16 2004-12-07 Sarnoff Corporation Enhanced MPEG information distribution apparatus and method
US6038346A (en) * 1998-01-29 2000-03-14 Seiko Espoo Corporation Runs of adaptive pixel patterns (RAPP) for lossless image compression
US6360017B1 (en) * 1998-03-05 2002-03-19 Lucent Technologies Inc. Perceptual-based spatio-temporal segmentation for motion estimation
GB9806767D0 (en) 1998-03-31 1998-05-27 Philips Electronics Nv Pixel colour valve encoding and decoding
US6097368A (en) * 1998-03-31 2000-08-01 Matsushita Electric Industrial Company, Ltd. Motion pixel distortion reduction for a digital display device using pulse number equalization
US6060890A (en) 1998-04-17 2000-05-09 Advanced Micro Devices, Inc. Apparatus and method for measuring the length of a transmission cable
JPH11308465A (en) 1998-04-17 1999-11-05 Seiko Epson Corp Encoding method for color image, encoder therefor, decoding method for color image and decoder therefor
JPH11313213A (en) 1998-04-27 1999-11-09 Canon Inc Information processing system, information processing method and medium
US6373890B1 (en) * 1998-05-05 2002-04-16 Novalogic, Inc. Video compression and playback process
US6571393B1 (en) 1998-05-27 2003-05-27 The Hong Kong University Of Science And Technology Data transmission system
US6202116B1 (en) 1998-06-17 2001-03-13 Advanced Micro Devices, Inc. Write only bus with whole and half bus mode operation
US6124811A (en) 1998-07-02 2000-09-26 Intel Corporation Real time algorithms and architectures for coding images compressed by DWT-based techniques
US6567464B2 (en) 1998-07-24 2003-05-20 Compaq Information Technologies Group, L.P. Fast retrain based on communication profiles for a digital modem
US6070214A (en) 1998-08-06 2000-05-30 Mobility Electronics, Inc. Serially linked bus bridge for expanding access over a first bus to a second bus
US6327307B1 (en) 1998-08-07 2001-12-04 Motorola, Inc. Device, article of manufacture, method, memory, and computer-readable memory for removing video coding errors
US6065073A (en) 1998-08-17 2000-05-16 Jato Technologies, Inc. Auto-polling unit for interrupt generation in a network interface device
WO2000011607A1 (en) * 1998-08-20 2000-03-02 Apple Computer, Inc. Deferred shading graphics pipeline processor
US6146158A (en) 1998-09-14 2000-11-14 Tagnology, Inc. Self-adjusting shelf mounted interconnect for a digital display
JP2000125111A (en) 1998-10-20 2000-04-28 Fujitsu Ltd Picture compression method, picture restoration method, picture compression device, picture reader, picture compression program storage medium and picture restoration program storage medium
US6418494B1 (en) 1998-10-30 2002-07-09 Cybex Computer Products Corporation Split computer architecture to separate user and processor while retaining original user interface
US6233226B1 (en) 1998-12-14 2001-05-15 Verizon Laboratories Inc. System and method for analyzing and transmitting video over a switched network
US6754241B1 (en) * 1999-01-06 2004-06-22 Sarnoff Corporation Computer system for statistical multiplexing of bitstreams
GB2350039B (en) 1999-03-17 2004-06-23 Adder Tech Ltd Computer signal transmission system
US6470050B1 (en) * 1999-04-09 2002-10-22 Matsushita Electric Industrial Co., Ltd. Image coding apparatus and its motion vector detection method
US7085319B2 (en) * 1999-04-17 2006-08-01 Pts Corporation Segment-based encoding system using segment hierarchies
TW546943B (en) * 1999-04-29 2003-08-11 Inventec Corp Chinese character input method and system with virtual keyboard
US6516371B1 (en) 1999-05-27 2003-02-04 Advanced Micro Devices, Inc. Network interface device for accessing data stored in buffer memory locations defined by programmable read pointer information
US6590930B1 (en) 1999-07-22 2003-07-08 Mysticom Ltd. Local area network diagnosis
JP2001053620A (en) 1999-08-13 2001-02-23 Canon Inc Method and device for encoding, method and device for decoding, and storage medium
US7046842B2 (en) * 1999-08-17 2006-05-16 National Instruments Corporation System and method for color characterization using fuzzy pixel classification with application in color matching and color match location
US6377313B1 (en) 1999-09-02 2002-04-23 Techwell, Inc. Sharpness enhancement circuit for video signals
US6833875B1 (en) 1999-09-02 2004-12-21 Techwell, Inc. Multi-standard video decoder
WO2001022628A1 (en) 1999-09-24 2001-03-29 Kestrel Solutions, Inc. Channel gain control for an optical communications system utilizing frequency division multiplexing
US7031385B1 (en) * 1999-10-01 2006-04-18 Matsushita Electric Industrial Co., Ltd. Method and apparatus for detecting scene change of a compressed moving-picture, and program recording medium therefor
JP4350877B2 (en) 1999-10-01 2009-10-21 パナソニック株式会社 Compressed video scene change detection device, compressed video scene change detection method, and recording medium recording the program
US7143432B1 (en) * 1999-10-01 2006-11-28 Vidiator Enterprises Inc. System for transforming streaming video data
US6370191B1 (en) 1999-11-01 2002-04-09 Texas Instruments Incorporated Efficient implementation of error approximation in blind equalization of data communications
US6664969B1 (en) 1999-11-12 2003-12-16 Hewlett-Packard Development Company, L.P. Operating system independent method and apparatus for graphical remote access
JP2001148849A (en) 1999-11-19 2001-05-29 Aiphone Co Ltd Video control system for multiple dwelling house
JP2001251632A (en) * 1999-12-27 2001-09-14 Toshiba Corp Motion vector detection method and system, and motion vector detection program
US6871008B1 (en) 2000-01-03 2005-03-22 Genesis Microchip Inc. Subpicture decoding architecture and method
US6522365B1 (en) 2000-01-27 2003-02-18 Oak Technology, Inc. Method and system for pixel clock recovery
US7158262B2 (en) * 2000-02-17 2007-01-02 Hewlett-Packard Development Company, L.P. Multi-level error diffusion apparatus and method of using same
US7013255B1 (en) * 2000-06-09 2006-03-14 Avaya Technology Corp. Traffic simulation algorithm for asynchronous transfer mode networks
JP2002043950A (en) 2000-07-21 2002-02-08 Canon Inc Coding method and device, and decoding method and device
US7689510B2 (en) 2000-09-07 2010-03-30 Sonic Solutions Methods and system for use in network management of content
US7058826B2 (en) 2000-09-27 2006-06-06 Amphus, Inc. System, architecture, and method for logical server and other network devices in a dynamically configurable multi-server network environment
JP2002165105A (en) 2000-11-27 2002-06-07 Canon Inc Image processing device, its method, and recording medium
US7093008B2 (en) * 2000-11-30 2006-08-15 Intel Corporation Communication techniques for simple network management protocol
JP3580251B2 (en) 2000-12-27 2004-10-20 日本電気株式会社 Data compression apparatus, compression method, and recording medium recording control program therefor
US6888893B2 (en) * 2001-01-05 2005-05-03 Microsoft Corporation System and process for broadcast and communication with very low bit-rate bi-level or sketch video
US20050249207A1 (en) 2001-01-29 2005-11-10 Richard Zodnik Repeater for locating electronic devices
US7145676B2 (en) 2001-01-31 2006-12-05 Hewlett-Packard Development Company, L.P. Compound document image compression using multi-region two layer format
JP2004532540A (en) * 2001-03-05 2004-10-21 インタービデオインコーポレイテッド System and method for error resilient coding
EP1393189A4 (en) * 2001-05-02 2007-06-13 Bitstream Inc Methods, systems, and programming for displaying media scaled-down by a variable scale factor
TWI220036B (en) 2001-05-10 2004-08-01 Ibm System and method for enhancing broadcast or recorded radio or television programs with information on the world wide web
US6901455B2 (en) 2001-06-29 2005-05-31 Intel Corporation Peripheral sharing device with unified clipboard memory
US6760235B2 (en) * 2001-09-13 2004-07-06 Netpower Technologies, Inc. Soft start for a synchronous rectifier in a power converter
JP3970007B2 (en) 2001-12-07 2007-09-05 キヤノン株式会社 Image processing apparatus, image processing method, program, and storage medium
JP4109875B2 (en) 2002-02-22 2008-07-02 キヤノン株式会社 Image encoding apparatus, image encoding method, program, and storage medium
JP2003244448A (en) 2002-02-15 2003-08-29 Canon Inc Encoding method and decoding method
EP1318665B1 (en) * 2001-12-06 2015-02-25 Canon Kabushiki Kaisha Image processing apparatus and method, program, and storage medium
EP1456963B1 (en) 2001-12-20 2006-09-13 Bhavik Amin Skew delay compensator
US7221389B2 (en) 2002-02-15 2007-05-22 Avocent Corporation Automatic equalization of video signals
GB2388504B (en) 2002-02-26 2006-01-04 Adder Tech Ltd Video signal skew
US6898313B2 (en) 2002-03-06 2005-05-24 Sharp Laboratories Of America, Inc. Scalable layered coding in a multi-layer, compound-image data transmission system
EP3029938A1 (en) 2002-03-15 2016-06-08 Nokia Technologies Oy Method for coding motion in a video sequence
US7373008B2 (en) * 2002-03-28 2008-05-13 Hewlett-Packard Development Company, L.P. Grayscale and binary image data compression
US7550870B2 (en) 2002-05-06 2009-06-23 Cyber Switching, Inc. Method and apparatus for remote power management and monitoring
US20030208976A1 (en) * 2002-05-08 2003-11-13 Tommie Ann Buchanan (Six Mile, Sc) Prefabricated insulation for HVAC ductwork and other fluid conduits
US6986107B2 (en) 2002-06-18 2006-01-10 Microsoft Corporation Dynamic generation of visual style variants for a graphical user interface
KR100472457B1 (en) 2002-06-21 2005-03-10 삼성전자주식회사 Method for encoding image differentially and apparatus thereof
US20060126718A1 (en) 2002-10-01 2006-06-15 Avocent Corporation Video compression encoder
US7321623B2 (en) 2002-10-01 2008-01-22 Avocent Corporation Video compression system
TW589871B (en) 2002-11-19 2004-06-01 Realtek Semiconductor Corp Method for eliminating boundary image zippers
US7428587B2 (en) 2002-12-19 2008-09-23 Microsoft Corporation Generating globally unique device identification
JP3764143B2 (en) 2003-01-10 2006-04-05 エヌ・ティ・ティ・コムウェア株式会社 Monitoring system, monitoring method and program thereof
US7536054B2 (en) * 2003-02-19 2009-05-19 Ishikawajima-Harima Heavy Industries Co., Ltd. Image compression device, image compression method, image compression program, compression encoding method, compression encoding device, compression encoding program, decoding method, decoding device, and decoding program
WO2004081772A1 (en) 2003-03-13 2004-09-23 Icd, Inc. D/B/A Display Werks Electronic display
US7367514B2 (en) * 2003-07-03 2008-05-06 Hand Held Products, Inc. Reprogramming system including reprogramming symbol
US9560371B2 (en) 2003-07-30 2017-01-31 Avocent Corporation Video compression system
US7606313B2 (en) * 2004-01-15 2009-10-20 Ittiam Systems (P) Ltd. System, method, and apparatus for error concealment in coded video signals
US20050198245A1 (en) 2004-03-06 2005-09-08 John Burgess Intelligent modular remote server management system
US7613854B2 (en) 2004-04-15 2009-11-03 Aten International Co., Ltd Keyboard video mouse (KVM) switch wherein peripherals having source communication protocol are routed via KVM switch and converted to destination communication protocol
US7457461B2 (en) 2004-06-25 2008-11-25 Avocent Corporation Video compression noise immunity
US7006700B2 (en) 2004-06-25 2006-02-28 Avocent Corporation Digital video compression command priority
EP1771998B1 (en) 2004-07-23 2015-04-15 Citrix Systems, Inc. Systems and methods for optimizing communications between network nodes
US7466713B2 (en) 2004-10-29 2008-12-16 Avocent Fremont Corp. Service processor gateway system and appliance
US7683896B2 (en) 2004-12-20 2010-03-23 Avocent Huntsville Corporation Pixel skew compensation apparatus and method
US7168702B1 (en) * 2005-07-19 2007-01-30 Shoemaker Stephen P Amusement device of skill and lottery
US7539795B2 (en) 2006-01-30 2009-05-26 Nokia Corporation Methods and apparatus for implementing dynamic shortcuts both for rapidly accessing web content and application program windows and for establishing context-based user environments
CA2650663A1 (en) * 2006-04-28 2007-11-08 Avocent Corporation Dvc delta commands
EP1927949A1 (en) 2006-12-01 2008-06-04 Thomson Licensing Array of processing elements with local registers

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JP平11-308465A 1999.11.05
JP平11-313213A 1999.11.09
JP平8-33000A 1996.02.02

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